The Biology Project: Biochemistry

Photosynthesis Problem Set 1

Problem 2: Energy source for ATP formation


The specific energy source for the reaction ADP + phosphate ATP by the enzyme ATP synthetase (CF1 Coupling Factor) in thylakoid membranes is:
A movement of electrons between photosystem II and photosystem I

B oxidation of water

C oxidation of NADPH

D absorption of photons by chloroplast pigments

E higher concentration of H+ inside versus outside the thylakoid membranes

The concentration gradient resulting from photosynthetic electron transport drives protons through a channel of the CF1 ATP Synthase enzyme. This movement of protons from a region of high concentration (inner thylakoid space) to low concentration (stroma) activates the conversion of ADP and Pi to ATP.

The Biology Project
University of Arizona
Thursday, October 3, 1996
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